Drafting device



Dec.. 27, 1966 L H. cHANocH 3,293,758 l DRAFTING DEVICE v Filed Sept.L8, 1964 Z?, 107 F11-G#I 13) lU I IN VENTO/Q 3 Lawrence H. Chanoch @WMVM United States Patent Oliice 3,293,758 Patented Dec. 27, 1966 3,293,758DRAFTING DEVICE Lawrence H. Chanoch, 7641 Klbourn Ave., Skokie, Ill.60076 Filed Sept. 18, 1964, Ser. No. 397,408 Claims. (Cl. 33-110) Thisinvention relates to an improved drafting device and more particularlyto a device for providing 'a uniform spacing between parallel lines andthe like in a drawing.

Draftsmen make a great deal of use of uniformly spaced parallel linesarranged l.at various angles, such as at angles of 30, 60, 45, 90 andthe like, with the horizontal, for purposes of sectioning, lettering andthe like. Conventional drafting techniques for making such lines ormarkings have required the use of a T -square and a scale for marking apattern and a triangle for use with the pattern to effect the parallellines. Uniform increments are usually laid out with a scale and then atriangle is displaced along the T-square for alignment with the pointsthat have been laid out and the langular lines are drawn.

It will be appreciated that failure accurately to align the edges of thetriangle with any of the plurality of marks or the failure uniformly toscale the increments Awill result in a lack. of uniformity in theseparation between the parallel lines which may detract from theappearance of the drawing or from the accuracy of the drawing.

It is an object of this invention to provide a new and improved devicefor use in marking a drawing with uniformly Ispaced increments `and/orfor drawing uniformly spaced parallel lines.

More particularly, it is an object of this invention to provide a newand improved drafting device whereby uniformly spaced parallel lines 0rmarkings may be effected without the use of a scale.

These and other objects of this invention will hereinafter appear andfor purposes of illustration, but not of limitation, an embodiment ofthe invention is shown in the accompanying drawing in -which- FIG. 1 isa top plan view of the drafting device ernbodying the features of thisinvention;

FIG. 2 is a sectional View taken along the line 2 2 of FIG. 1;

FIG. 3 is a perspective view showing the drafting device of thisinvention employed in combination with a T-square and triangle; and

FIG. 4 is a view taken along the line 4-4 of FIG. 3.

Referring now to the drawing, the drafting device comprises an elongatestrip having 'a rib 11 extending longitudinally of the strip to projectupwardly from the upper surface thereof intermediate the lateral edgesof the strip and preferably from about the mid-portion thereof tosubdivide the strip into a stabilizing portion 12 on one side of the riband a grooved portion 13 on the other side of the rib.

The stabilizing portion is provided with 'anti-slip means on the topsurface to enable a more efficient gripping relationship to beestablished between the bottom side of the T-square or other draftingdevice and the upper surface of the strip portion adapted to underliethe T- square with the rib in abutting relationship with the straightedge of the T-square or other drafting device for proper alignment. Suchgripping means may be in the form of an anti-slip coating 14 ofrubberized material with -or without a grit, provided as an overallcoating on the one side of the rib, or as spaced islands of antislipmaterial, or as lined or patterned coatings on the surface of the strip.

The grooved portion 13 on the other side of the rib comprises aplurality of crosswise extending grooves impressed in the top surface ofthe strip. In the alternative, it may comprise a plurality of crosswiseextending ribs or` uprights on the top surface of the strip. Suchgrooves or ribs are adapted uniformly to be spaced one from the otherlengthwise of the strip to define the uniform spacing of liines intendedto be drawn or markings intended to be ma e.

The grooves or ribs may be spaced one from the other by a uniform amountthroughout the length of the strip or the strip may be formed with onegroup of grooves spaced from the other and with other groups of groovesspaced one from the other by other amounts so that the one device may beused to provide a single spaced pattern or one device may be employedmore flexibly for different spaced patterns and the like.

In illustrating the uses that may be made of the device, descriptionwill hereinafter be made of its use in combination with a T-square anddraftsman triangle but it will be understood that similar usa-ge may bemade with a triangle or other drafting devices having a straight edgefor use in alignment of the device.

In use with a T-square, the portion 12 having the Iantislip means ispositioned under the edge of the T-square 15 with the rib 11 of thedevice aligned to abut against the edge 16 of the T-square. A triangle17, having a detent 18 extending downwardly from its bottom side so |asto be received in fitting relationship within the grooves, is placedover the grooved portion 13 of the device. Although only one detent isrequired, it will be apparent that it would be. desirable to providesuch a detent centrally placed along each edge of the triangle therebygreatly to facilitate its use with the device.

'Ihe edge 18 of the triangle is urged against the upright 11 of theT-square with the detent 18 fitting into v one of the crosswise grooves13. When the triangle is displaced lengthwise relative to the T-squareby one increment, the detent Will `be displaced from the first grooveinto the second groove which will then function as a stop to align thetriangle with the corresponding spacing from the first position. If adouble spacing is required, then the triangle may be displaced to passbeyond the next groove into the third groove, etc. Thus the detentcoacts with the grooves to permit displacement of the triangle byuniform increments parallel to the T-square for use in scribing ofuniformly spaced parallel lines along either side 21 or 20 of thetriangle.

It will be appreciated that the anti-slip member in contact with theunderside of the T-square prevents inadvertent displacement of thedevice when the triangle is shifted along the edge of the T-square fromgroove to groove. Stabilization of the device with respect to theT-square operates also to insure that the incremental movements of thetriangle relative to the T-square will be uniform thereby to insureuniform spacing between the lines or marks that are drawn.

The device embodying the features of this invention may be formed of anysuitable material that will -provide =a relatively rigid structurecapable of repeated use. It may be formed of plastics, laminated paper,or of sheet metal, or combinations thereof.

The uniformly spaced grooves in the grooved portion 13 of the strip maybe formed continuously in an endless strip by the use of a repeatingstamping means in synchronous relation to the moving endless stripwhereby the endless strip is run between the pressure portions of thestamping means to impress the desired groove pattern in the surfaceportions thereof.

It will be apparent from the foregoing that I have provided 4aninexpensive device which may be employed in a simple and eliicientmanner with conventional draftsmans tools to provide for uniform spacingor marking in drawings and the like.

It will be understood that changes may be made in the details ofconstruction, arrangement land operation without departing from thespirit of the invention, especially as defined in the following claims.

I claim:

1. A drafting device for uniform spacing comprising lan elongate striphaving an upright rib extending lon-gitudinally substantially throughoutthe length of the strip intermediate the lateral edges to subdivide thestrip into 'a stabilizing portion and a grooved portion, anti-slip meanson the surface of the stabilizing portion and crosswise extendinggrooves in the grooved portion with the grooves having a predeterminedspaced relationship therebetween and a member having at least twostraight edges with one of the straight edges adapted to be positionedon the grooved portion of the stri-p in abutting relationship with therib, and ia rib adjacent the straight edge of the member in position tocooperate with the grooves of the strip.

2. A drafting device as claimed in claim 1 in which the rib extendsupwardly from the surface of the strip substantially midway between thelateral edges.

3. A drafting device as claimed in claim 1 in which the grooves areuniformly spaced one from the other substantially throughout the lengthof the strip.

4. A drafting device as claimed in claim 1 in which the strip issubdivided longitudinally into sections with the grooves in one sectionuniformly spaced one from the other and with grooves in the varioussections being spaced one from the other by an amount differing from thegrooves -in others of the sections.

5. In a drafting device for use in combination with a member having atleast two straight edges arranged in angular relation one with the otherand with a proje-ction adjacent each straight edge, an elongate striphaving an upright rib extending longitudinally substantially throughoutthe length of the strip intermediate the lateral edges to subdivide thestrip into a stabilized portion and a grooved portion and adapted toreceive a straight edge of the member in abutting relationship therewithto align the member with the strip land positioned to receive theprojection adjacent the straight edge for releasably positioning themember in the desired space along the strip.

References Cited by the Examiner UNITED STATES PATENTS 470,754 3/1892Hartig 33-107 888,070 5/1908 Dissell 33-103 FOREIGN PATENTS 442,973 7/1912 France.

826,444 1/ 1938 France.

OTHER REFERENCES Publication: Popular Science, February 1956, page 236,Adhesive Skidproofs Template.

LEONARD FORMAN, Primary Examiner.

HARRY N. HAROIAN, Examiner.

1. A DRAFTING DEVICE FOR UNIFORM SPACING COMPRISING AN ELONGATE STRIPHAVING AN UPRIGHT RIB EXTENDING LONGITUDINALLY SUBSTANTIALLY THROUGHOUTTHE LENGTH OF THE STRIP INTERMEDIATE THE LATERAL EDGES TO SUBDIVIDE THESTRIP INTO A STABILIZING PORTION AND A GROOVED PORTION, ANTI-SLIP MEANSON THE SURFACE OF THE STABILIZING PORTION AND CROSSWISE EXTENDINGGROOVES IN THE GROOVED PORTION WITH THE GROOVES HAVING A PREDETERMINEDSPACED RELATIONSHIP THEREBETWEEN AND A MEMBER HAVING AT LEAST TWOSTRAIGHT EDGES WITH ONE OF THE STRAIGHT EDGES ADAPTED TO BE POSITIONEDON THE GROOVED PORTION OF THE STRIP IN ABUTTING RELATIONSHIP WITH THERIB, AND A RIB ADJACENT THE STRAIGHT EDGE OF THE MEMBER IN POSITION TOCOOPERATE WITH THE GROOVES OF THE STRIP.